问题

We should stop people from_____ the street when the light is red.
A:walk
B:walking
C:to walk
D:walked
B:walking
C:to walk
D:walked
正确答案是:
同类题型
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When you to learn to skate? — Five years ago.
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The classroom is _________ clean _______ it was yesterday. ——Sorry, I forgot to clean it.